Cathode optical structure of miniature micro-focal-spot X-ray tube

Abstract

The invention belongs to the miniature micro-focal-spot X-ray tube technology field and especially relates to a cathode optical structure of a miniature micro-focal-spot X-ray tube. The structure comprises a thermionic shaping structure (1), an accelerated electron focusing structure (2), a hot cathode filament (4), an isolated hot cathode filament electrode column (7) and a ceramic gasket (8). The accelerated electron focusing structure (2) is a hollow cylinder structure, a first playground-shaped structure (11) is arranged on an upper portion, a second playground-shaped structure (9) is arranged on a lower portion, and the two are orthogonally and vertically arranged. The thermionic shaping structure (1) is installed on a top of the accelerated electron focusing structure (2), a cathodefilament electrode column (13) is fixed to the thermionic shaping structure (1), a round hole (14) is arranged, and the ceramic gasket (8) is additionally arranged on an external portion. The isolatedhot cathode filament electrode column (7) successively passes through the round hole and the round hole (14) formed in the ceramic gasket (8) and is fixedly connected with one end of the hot cathodefilament (4), and the other end is fixedly connected to the cathode filament electrode column (13).

Description

technical field [0001] The invention belongs to the technical field of miniature micro-focus spot X-ray tubes, in particular to a cathode optical structure of a miniature micro-focus spot X-ray tube. Background technique [0002] The structure of a common micro X-ray tube mainly includes an electron cathode and an anode target, and a high voltage electric field needs to be applied between the electron cathode and the anode target. The electron cathode emits electrons, which bombard the anode target under the acceleration of the high-voltage electric field, and generate X-rays through bremsstrahlung. Due to volume constraints and technical complexity, ordinary micro X-ray tubes generally have no electrostatic focusing structure and no magnetic focusing structure, so the size of the X-ray focal spot is generally relatively large, basically above millimeters, which cannot meet high resolution Application requirements of non-destructive testing. [0003] Generally speaking, in...

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Problems solved by technology

However, the helical wire has defects such as difficult processing and weak anti-vibration ability, especially in environments where it is difficult to withstand rocket launches or harsh mechanical conditions, which limits its application in multiple scenarios, especially in space.

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